Skip to content
Oath Peptides Is Now Oath Research!
Oath USA Series – 100% Made in the USA
3rd Party Lab Tested
Free Shipping on Orders Over $250
The Purest Peptides. Period.
0
Sale!
TB-500
Made in the USA
Two Series. Local or Global Shipping

TB-500

Price range: $40.00 through $307.99

TB-500 is the synthetic form of Thymosin Beta-4, a 43-amino-acid peptide first isolated from calf thymus tissue in the 1960s. It has the molecular formula C212H350N56O78S, a molecular weight of 4,963.4 g/mol, and is identified by CAS number 77591-33-4. The peptide is notable for containing a central actin-binding domain — a region structurally complementary to actin, a major structural protein found in biology. Thymosin Beta-4 is classified as a naturally occurring intracellular peptide and is one of the most abundant members of the beta-thymosin family. TB-500 is supplied as a white to off-white lyophilized powder, soluble in water, and should be stored frozen for long-term stability. This product is strictly for research purposes only.

3 Day FAST Shipping

99%+ Purity Tests

Ships from Arizona & Worldwide

USA Lab Tested

Proudly Made in the USA
USA-manufactured and USA-tested research products with fulfillment from Arizona, the UK, Australia, Europe, or Hong Kong.
USA Manufactured
USA Lab Tested
Ships from Arizona, US
✓ Third-Party Lab Tested

Certificate of Analysis

Independent laboratory testing confirms purity and composition of this research peptide.

Endo Passed

99.110%
Purity
A2926031
Batch
August 2026
Date

View Certificate →

Overview

TB-500 is the synthetic form of Thymosin Beta-4, a 43-amino-acid peptide with the molecular formula C212H350N56O78S and a molecular weight of 4,963.4 g/mol. The naturally occurring version of this peptide was first isolated from calf thymus tissue in the 1960s during research into thymus gland extracts. TB-500 corresponds to the active region of the full Thymosin Beta-4 sequence.

Structurally, Thymosin Beta-4 is an unstructured, highly flexible peptide in solution, meaning it does not fold into a fixed three-dimensional shape the way many larger proteins do. It contains a central actin-binding domain — a stretch of amino acids structurally complementary to actin, one of the most common structural proteins in biology. The compound is identified by CAS number 77591-33-4 and appears as a white to off-white lyophilized powder that is soluble in water. It should be stored frozen for long-term stability.

This product is strictly for research purposes only.

PubChem Reference: View compound profile on NIH PubChem

This product is strictly for research purposes only. Not approved for human or animal use.

Key Characteristics

MOLECULAR PROFILE

Formula: C212H350N56O78S

Weight: 4963.4 g/mol

CAS: 77591-33-4

Structure: 43 amino acid peptide

PHYSICAL PROPERTIES

Form: Lyophilized powder

Solubility: Water-soluble

Appearance: White to off-white powder

Storage: Store in freezer for long-term stability

Additional information

Weight 0.08 lbs
Dimensions 0.87 × 1.18 × 0.87 in
Peptide

TB-500 / Thymosin Beta-4
Strength

2mg, 5mg, 10mg
CAS Number

77591-33-4
PubChem CID

16132341
Purity

≥99% (third-party HPLC and mass spectrometry verified)
Form

Lyophilized powder
Storage

Store at −20°C (−4°F) for long-term storage or 4°C (39°F) for short-term storage; avoid repeated freeze-thaw cycles.
Testing

Batch-specific COA included
Origin

Manufactured in the US
Purchase Option

Fast Stock — From 1 Vial, Global — 10 Vial Kit
SKU: TB5-TB-500-THYMOSIN-BETA-4 Categories: , Tags: , , , , , , , ,

Related products

Purity takes patience

Enter your email address below to join the waitlist. We’ll notify you as soon as this product is back in stock.

Alternatively, check our Global Stock, shipped from Hong Kong and kept consistently available for international orders.